1165564909656 has 128 divisors (see below), whose sum is σ = 3701752358400. Its totient is φ = 332879379840.

The previous prime is 1165564909637. The next prime is 1165564909661. The reversal of 1165564909656 is 6569094655611.

1165564909656 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 5 + 6 + 490 + 96 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 1165564909593 and 1165564909602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3485566 + ... + 3805298.

It is an arithmetic number, because the mean of its divisors is an integer number (28919940300).

Almost surely, 2^{1165564909656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165564909656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1850876179200).

1165564909656 is an abundant number, since it is smaller than the sum of its proper divisors (2536187448744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1165564909656 is a wasteful number, since it uses less digits than its factorization.

1165564909656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322166 (or 322156 counting only the distinct ones).

The product of its (nonzero) digits is 52488000, while the sum is 63.

The spelling of 1165564909656 in words is "one trillion, one hundred sixty-five billion, five hundred sixty-four million, nine hundred nine thousand, six hundred fifty-six".